Leaders still vague on emissions targets
Olive Heffernan on the G8 talks that fail to advance the fight against climate change.
Spending plan appeases UK physicists
Geoff Brumfiel says an uneasy truce has been struck after re-arrangement of limited funds.
Fossilized feathers may hold a trace of colour
Katharine Sanderson on how pigment remains might help to discern colours and patterns in feathered dinosaurs.